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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.2"></a>
<FONT color="green">003</FONT>     * you may not use this file except in compliance with the License.<a name="line.3"></a>
<FONT color="green">004</FONT>     * You may obtain a copy of the License at<a name="line.4"></a>
<FONT color="green">005</FONT>     *<a name="line.5"></a>
<FONT color="green">006</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.6"></a>
<FONT color="green">007</FONT>     *<a name="line.7"></a>
<FONT color="green">008</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.8"></a>
<FONT color="green">009</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.9"></a>
<FONT color="green">010</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.10"></a>
<FONT color="green">011</FONT>     * See the License for the specific language governing permissions and<a name="line.11"></a>
<FONT color="green">012</FONT>     * limitations under the License.<a name="line.12"></a>
<FONT color="green">013</FONT>     */<a name="line.13"></a>
<FONT color="green">014</FONT>    package com.googlecode.jsendnsca.utils;<a name="line.14"></a>
<FONT color="green">015</FONT>    <a name="line.15"></a>
<FONT color="green">016</FONT>    import org.apache.commons.lang.StringUtils;<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>    /**<a name="line.18"></a>
<FONT color="green">019</FONT>     * Utility methods for writing to a byte array<a name="line.19"></a>
<FONT color="green">020</FONT>     * <a name="line.20"></a>
<FONT color="green">021</FONT>     * @author Raj Patel<a name="line.21"></a>
<FONT color="green">022</FONT>     * @version 1.0<a name="line.22"></a>
<FONT color="green">023</FONT>     */<a name="line.23"></a>
<FONT color="green">024</FONT>    public class ByteArrayUtils {<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>        private ByteArrayUtils() {<a name="line.26"></a>
<FONT color="green">027</FONT>            // private constructor as only supports static methods<a name="line.27"></a>
<FONT color="green">028</FONT>        }<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>        /**<a name="line.30"></a>
<FONT color="green">031</FONT>         * Creates a fixed size byte array, populates it with contents of a String<a name="line.31"></a>
<FONT color="green">032</FONT>         * and writes this to a destination byte array<a name="line.32"></a>
<FONT color="green">033</FONT>         * <a name="line.33"></a>
<FONT color="green">034</FONT>         * @param dest<a name="line.34"></a>
<FONT color="green">035</FONT>         *            the destination byte array<a name="line.35"></a>
<FONT color="green">036</FONT>         * @param value<a name="line.36"></a>
<FONT color="green">037</FONT>         *            the {@link String} value<a name="line.37"></a>
<FONT color="green">038</FONT>         * @param offset<a name="line.38"></a>
<FONT color="green">039</FONT>         *            the offset to write to in the destination array<a name="line.39"></a>
<FONT color="green">040</FONT>         * @param fixedSize<a name="line.40"></a>
<FONT color="green">041</FONT>         *            the size of the byte array to place the {@link String} into<a name="line.41"></a>
<FONT color="green">042</FONT>         */<a name="line.42"></a>
<FONT color="green">043</FONT>        public static void writeFixedString(byte[] dest, String value, int offset, int fixedSize) {<a name="line.43"></a>
<FONT color="green">044</FONT>            System.arraycopy(getFixedSizeBytes(fixedSize, value), 0, dest, offset, fixedSize);<a name="line.44"></a>
<FONT color="green">045</FONT>        }<a name="line.45"></a>
<FONT color="green">046</FONT>    <a name="line.46"></a>
<FONT color="green">047</FONT>        /**<a name="line.47"></a>
<FONT color="green">048</FONT>         * Write a short to a byte array<a name="line.48"></a>
<FONT color="green">049</FONT>         * <a name="line.49"></a>
<FONT color="green">050</FONT>         * @param dest<a name="line.50"></a>
<FONT color="green">051</FONT>         *            the destination byte array<a name="line.51"></a>
<FONT color="green">052</FONT>         * @param value<a name="line.52"></a>
<FONT color="green">053</FONT>         *            the short value to be written<a name="line.53"></a>
<FONT color="green">054</FONT>         * @param offset<a name="line.54"></a>
<FONT color="green">055</FONT>         *            the offset to write to in the destination array<a name="line.55"></a>
<FONT color="green">056</FONT>         */<a name="line.56"></a>
<FONT color="green">057</FONT>        public static void writeShort(byte[] dest, short value, int offset) {<a name="line.57"></a>
<FONT color="green">058</FONT>            System.arraycopy(ByteArrayUtils.shortToByteArray(value), 0, dest, offset, 2);<a name="line.58"></a>
<FONT color="green">059</FONT>        }<a name="line.59"></a>
<FONT color="green">060</FONT>    <a name="line.60"></a>
<FONT color="green">061</FONT>        /**<a name="line.61"></a>
<FONT color="green">062</FONT>         * Write an integer to a byte array<a name="line.62"></a>
<FONT color="green">063</FONT>         * <a name="line.63"></a>
<FONT color="green">064</FONT>         * @param dest<a name="line.64"></a>
<FONT color="green">065</FONT>         *            the destination byte array<a name="line.65"></a>
<FONT color="green">066</FONT>         * @param value<a name="line.66"></a>
<FONT color="green">067</FONT>         *            the integer value to be written<a name="line.67"></a>
<FONT color="green">068</FONT>         * @param offset<a name="line.68"></a>
<FONT color="green">069</FONT>         *            the offset to write to in the destination array<a name="line.69"></a>
<FONT color="green">070</FONT>         */<a name="line.70"></a>
<FONT color="green">071</FONT>        public static void writeInteger(byte[] dest, int value, int offset) {<a name="line.71"></a>
<FONT color="green">072</FONT>            System.arraycopy(ByteArrayUtils.intToByteArray(value), 0, dest, offset, 4);<a name="line.72"></a>
<FONT color="green">073</FONT>        }<a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>        /**<a name="line.75"></a>
<FONT color="green">076</FONT>         * Get a fixed size byte array populated with the contents of a<a name="line.76"></a>
<FONT color="green">077</FONT>         * {@link String} If the {@link String} length is larger than the byte<a name="line.77"></a>
<FONT color="green">078</FONT>         * array, the String will be truncated to the fixed size<a name="line.78"></a>
<FONT color="green">079</FONT>         * <a name="line.79"></a>
<FONT color="green">080</FONT>         * @param fixedSize<a name="line.80"></a>
<FONT color="green">081</FONT>         *            the size of the byte array to place the {@link String} into<a name="line.81"></a>
<FONT color="green">082</FONT>         * @param value<a name="line.82"></a>
<FONT color="green">083</FONT>         *            the {@link String} value<a name="line.83"></a>
<FONT color="green">084</FONT>         * @return the populated byte array<a name="line.84"></a>
<FONT color="green">085</FONT>         */<a name="line.85"></a>
<FONT color="green">086</FONT>        public static byte[] getFixedSizeBytes(int fixedSize, String value) {<a name="line.86"></a>
<FONT color="green">087</FONT>            if (value == null)<a name="line.87"></a>
<FONT color="green">088</FONT>                return null;<a name="line.88"></a>
<FONT color="green">089</FONT>            if (StringUtils.isBlank(value))<a name="line.89"></a>
<FONT color="green">090</FONT>                return new byte[fixedSize];<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>            final byte[] myBytes = new byte[fixedSize];<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>            if (value.length() &gt; fixedSize) {<a name="line.94"></a>
<FONT color="green">095</FONT>                value = value.substring(0, fixedSize);<a name="line.95"></a>
<FONT color="green">096</FONT>            }<a name="line.96"></a>
<FONT color="green">097</FONT>    <a name="line.97"></a>
<FONT color="green">098</FONT>            System.arraycopy(value.getBytes(), 0, myBytes, 0, value.getBytes().length);<a name="line.98"></a>
<FONT color="green">099</FONT>            return myBytes;<a name="line.99"></a>
<FONT color="green">100</FONT>        }<a name="line.100"></a>
<FONT color="green">101</FONT>    <a name="line.101"></a>
<FONT color="green">102</FONT>        /**<a name="line.102"></a>
<FONT color="green">103</FONT>         * Creates a byte array of 4 elements populated with an integer<a name="line.103"></a>
<FONT color="green">104</FONT>         * <a name="line.104"></a>
<FONT color="green">105</FONT>         * @param value<a name="line.105"></a>
<FONT color="green">106</FONT>         *            the integer value<a name="line.106"></a>
<FONT color="green">107</FONT>         * @return the byte array<a name="line.107"></a>
<FONT color="green">108</FONT>         */<a name="line.108"></a>
<FONT color="green">109</FONT>        public static byte[] intToByteArray(int value) {<a name="line.109"></a>
<FONT color="green">110</FONT>            final byte[] data = new byte[4];<a name="line.110"></a>
<FONT color="green">111</FONT>    <a name="line.111"></a>
<FONT color="green">112</FONT>            for (int i = 0; i &lt; data.length; i++) {<a name="line.112"></a>
<FONT color="green">113</FONT>                int offset = (data.length - 1 - i) * 8;<a name="line.113"></a>
<FONT color="green">114</FONT>                data[i] = (byte) ((value &gt;&gt;&gt; offset) &amp; 0xFF);<a name="line.114"></a>
<FONT color="green">115</FONT>            }<a name="line.115"></a>
<FONT color="green">116</FONT>    <a name="line.116"></a>
<FONT color="green">117</FONT>            return data;<a name="line.117"></a>
<FONT color="green">118</FONT>        }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>        /**<a name="line.120"></a>
<FONT color="green">121</FONT>         * Creates a byte array of 2 elements populated with an short<a name="line.121"></a>
<FONT color="green">122</FONT>         * <a name="line.122"></a>
<FONT color="green">123</FONT>         * @param value<a name="line.123"></a>
<FONT color="green">124</FONT>         *            the short value<a name="line.124"></a>
<FONT color="green">125</FONT>         * @return the byte array<a name="line.125"></a>
<FONT color="green">126</FONT>         */<a name="line.126"></a>
<FONT color="green">127</FONT>        public static byte[] shortToByteArray(short value) {<a name="line.127"></a>
<FONT color="green">128</FONT>            final byte[] data = new byte[2];<a name="line.128"></a>
<FONT color="green">129</FONT>    <a name="line.129"></a>
<FONT color="green">130</FONT>            for (int i = 0; i &lt; data.length; i++) {<a name="line.130"></a>
<FONT color="green">131</FONT>                int offset = (data.length - 1 - i) * 8;<a name="line.131"></a>
<FONT color="green">132</FONT>                data[i] = (byte) ((value &gt;&gt;&gt; offset) &amp; 0xFF);<a name="line.132"></a>
<FONT color="green">133</FONT>            }<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>            return data;<a name="line.135"></a>
<FONT color="green">136</FONT>        }<a name="line.136"></a>
<FONT color="green">137</FONT>    }<a name="line.137"></a>




























































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